Thank you for taking the time to report this bug and helping to make
Ubuntu better.

Bug reporting is mostly about finding & fixing problems thus preventing
future users from hitting the same bug.

I suspect a Support site would be more appropriate, eg.
https://answers.launchpad.net/ubuntu. You can also find help with your
problem in the support forum of your local Ubuntu community
http://loco.ubuntu.com/ or asking at https://askubuntu.com or
https://ubuntuforums.org, or for more support options please look at
https://discourse.ubuntu.com/t/community-support/709

For example, you provided no clues as to if any keyboard functions work,
does it include trying to switch to a text terminal (ctrl+alt+f4),
commands given directly to kernel (ie. to kill your GUI, reboot etc).  I
get the feeling your issue maybe just thrashing, or if you don't have
swap enabled, enabling swap may reduce your issue significantly.. These
are areas that support can help with, or if they've already been
attempted, those issues mentioned as making no change, or issue remains
for each thing tried.

(depending on how your keyboard is powered; I'd also check your hardware
including power-supply)

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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1876503

Title:
  Keyboard input suddenly stops to work, but when i log off and relog it
  comes back to normal.(I cant use keyboard after the bug happens, but i
  can do it normaly after log out- log on)

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